Discussion
Catabolite repression of the lac operon is relieved by the binding of ________.
Answer: C
Correct answer: the CAP-cAMP complex to the promoter region
When glucose is scarce, cAMP rises and the catabolite activator protein binds it. The CAP-cAMP complex then binds near the promoter and helps recruit RNA polymerase, which is why the operon is fully expressed only when glucose is absent and lactose present.
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